This ticket exists to track the upgrade of pybind11 in the stack.
We are running pybind11 2.2.4. Ideally we upgrade to the latest version 2.5.
Due to what is built in conda-forge, this may block upgrading to a newer boost and python 3.8.
ndarray is at least a known blocker, other packages may be as well.
This github issue may have some information relevant to fixing both ndarray and other parts of the stack: